Hoffman 78 Main Air Valve

This Hoffman product is used for releasing air from hot or cold water or glycol mains, hydronic heating, and chilling systems, storage and processing tank filters, centrifugal pumps with specific gravity greater than 0.7. Cast iron body and cover, stainless steel interior. There is a maximum operating pressure 250 psig (17.3 bar)(Maximum pressure against which the vent can open). The maximum hydrostatic pressure 350 psig (24.2 bar) and a maximum temperature 300°F (149°C).